<template>
    <div class="cmt-container">
        <hr>
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入评论内容（最多120字" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComments">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户：{{item.user_name}}&nbsp;&nbsp;发表时间：{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content === 'undefined' ? '此用户很懒，什么都没留下。。。。' : item.content}}
                </div>
            </div>

        </div>
        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from 'mint-ui'
export default {
    data() {
        return {
            pageIndex: 1,
            comments: [],
            msg: ''
        };
    },
    created() {
        this.getComments()
    },
    methods: {
        // 获取评论
        getComments() {
            this.$http.get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex).then(result => {
                if(result.body.status === 0){
                    // this.comments = result.body.message;
                    this.comments = this.comments.concat(result.body.message)
                }else{
                    Toast("获取评论失败！")
                }
            })
        },
        // 加载更多
        getMore() {
            this.pageIndex ++;
            this.getComments();
        },
        // 发表评论
        postComments() {
            // 检验 是否为空
            if(this.msg.trim().length === 0){
                return Toast("评论内容不能为空！")
            }
            this.$http.post('api/postcomment/' + this.$route.params.id,{ content: this.msg.trim() }).then(function (result) {
                if(result.body.status === 0){
                    // 1.拼接一个评论对象
                    var cmt = { 
                        user_name: '匿名用户', 
                        add_time: Date.now(), 
                        content: this.msg.trim()
                    };
                    this.comments.unshift(cmt);
                    this.msg = '';
                }else{
                    Toast("错误！")
                }  
            });
        }
    },
    props: ["id"]
}
</script>

<style lang="scss">
.cmt-container{
    float: left;
    width: 100%;
    h3{
        font-size: 18px;
        color: #226aff;
         display: flex;
    }
    textarea{
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>